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My website has a profile page for each of the home improvement contractors who signs up.  They accumulate reviews on those pages.  I want to build a review widget to display our reviews on our contractors' websites.  How can I avoid duplicate content issues for the reviews? Example of a profile page with a few reviews:  http://www.thehomefixers.com/members/425/waterheaters-plus-llc.php

How good is Google at detecting the affiliate nature of those links?  How does this rate as a linkbuilding strategy?

I'm just getting started in guest blogging, and had an idea I wanted to run past the SEOmoz community. I've been told that when guest blogging, it's only worthwhile to post one guest post per domain (if your intention is purely backlinks, which mine is).  But I was wondering if it might be more effective to try and place a series of 4 or 5 related posts, and try to get the blog owner to link from one to the other (Click here for Part II of this series). Wouldn't all that internal linking give the pages with my bio links on them that much more authority?

I'm creating a series of link bait videos.  I want people to link to the pages on my site hosting the videos.  What's the best site to host them on, if my primary concern is to get do-followed links? I'm worried about putting them on YouTube, as I imagine most of the links will be to the page on youtube.com, or worse, just directly embedded.

Why does buying links still work?  I don't mean approaching an individual webmaster and cutting a deal, that seems to be nearly impossible to detect.  But the huge link brokers, like Text Link Ads, Build my Rank or Linkvine, Google has to be aware of them, right?  Can't they just create accounts to see the whole network, and ban the sites?  Why wouldn't they just do that?

My site is starting to generate natural links (hooray!).  Basically, as part of my client sign-up process, I encourage my clients (home improvement contractors, plumbers, roofers, electricians) to link back to their own profile page on my site from their own site, either manually or using a badge I've created and made available.  I have 2 questions about this. First of all, the vast majority of these links are from seriously low quality sites with basically no backlink profile whatsoever.  Many of these sites aren't even indexed.  So I'm starting to feel like I'm doing all this hard work for nothing.  Is there anything I can do to increase the value of these incoming links, without spending too much time or money?  I'm thinking directory submission and/or link wheel gigs on fiverr (really crappy SEO, I know, but just to get these sites bumped up a notch, and hopefully not do any damage to my site, as they're a step removed.) Second question, the profile pages that my clients can create on my site includes a nofollowed link to their site.  Does the nofollow save me from having all of my incoming links tagged as reciprocal?  Is there anything else I should be doing?